The Collaborative International Dictionary
Mutuation
Mutuation \Mu`tu*a"tion\, n. [L. mutuatio, fr. mutuare, mutuari,
to borrow, fr. mutuus. See Mutual.]
The act of borrowing or exchanging. [Obs.]
--Bp. Hall.
Wiktionary
mutuation
n. (context obsolete English) The act of borrowing or exchange.